Add jaggl_dri implementation

gl-dri-natives/pom.xml

@@ -9,7 +9,26 @@
   </parent>
 
   <artifactId>openrs2-gl-dri-natives</artifactId>
-  <packaging>jar</packaging>
+  <packaging>nar</packaging>
 
   <name>OpenRS2 GL DRI Natives</name>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>com.github.maven-nar</groupId>
+        <artifactId>nar-maven-plugin</artifactId>
+        <configuration>
+          <linker>
+            <sysLibs>
+              <sysLib>
+                <type>shared</type>
+                <name>dl</name>
+              </sysLib>
+            </sysLibs>
+          </linker>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
 </project>

gl-dri-natives/src/main/c/jaggl_dri.c

@@ -0,0 +1,29 @@
+#include "jaggl_X11_dri.h"
+
+#include <dlfcn.h>
+#include <stddef.h>
+
+static void *jaggl_dri_handle;
+
+JNIEXPORT jboolean JNICALL Java_jaggl_X11_dri_open(JNIEnv *env, jclass cls, jstring path) {
+	if (jaggl_dri_handle) {
+		dlclose(jaggl_dri_handle);
+		jaggl_dri_handle = NULL;
+	}
+
+	const char *path_str = (*env)->GetStringUTFChars(env, path, NULL);
+	jaggl_dri_handle = dlopen(path_str, RTLD_LAZY | RTLD_GLOBAL);
+	(*env)->ReleaseStringUTFChars(env, path, path_str);
+
+	return jaggl_dri_handle != NULL;
+}
+
+JNIEXPORT jboolean JNICALL Java_jaggl_X11_dri_close(JNIEnv *env, jclass cls) {
+	if (jaggl_dri_handle) {
+		dlclose(jaggl_dri_handle);
+		jaggl_dri_handle = NULL;
+		return JNI_TRUE;
+	}
+
+	return JNI_FALSE;
+}